Chevrolet Colorado Gearbox Overdrive

[111tingtong]

Hi All,

I have an issue with my Colorado Gearbox where the overdrive won't engage, it was working previously. The pick-has been converted from manual gearbox to an automatic. The automatic gearbox is from an Isuzu, there is a plate on the side of the gearbox with model number 03-72L (AISIM AW Co. Ltd).

I read on some Isuzu forum some time ago that there is a temp sensor on the gearbox somewhere that if non-operable will stop the overdrive working. The purpose of the temp sensor is to allow the gearbox to warm up before the overdrive can be selected. However I am not certain where the sensor is located or if it has been fitted during the modification at all!

Below are some photos of the gearbox.

If anyone has any ideas where the fault could be or the temp sensor is located please let me know, its a pain on the highway not being able to select this gear and costing a bomb at the same time.

I live in Chiang Mai and if anyone knows of any gearbox specialist please let me know. I took the pick-up to Chevrolet and they dont want to know as it has an Isuzu gearbox in it, i took it to Isuzu and they dont want to know as its a Chevrolet!!!!!! grrrrrr

Any assistance would be appreciated.

Cheers

Below the first sensor

On the right hand side there is the the gear linkage which also has some wires going into it.

On the left hand side of the box there is another sensor!?! fitted. I removed the two bolts and had a look but it doesn't look like a temp sensor. There were two o rings and a couple of ports, maybe a pressure sensor!

Another picture of this sensor in the center of the photo with the loom attached.

And here's the gear lever with the overdrive button.

[John 1]

just a long shot check to see if the wire's from O/d button are hooked up